Chain



FIG. 1 is a front view of a portion of the chain showing my new design;

FIG. 2 is a front view of the chain shown in FIG. 1 being rotated through 90° degrees;

FIG. 3 is a front view of a link of the chain shown in FIG. 1;

FIG. 4 is a bottom view of the link shown in FIG. 3; and,

FIG. 5 is a side view of the link shown in FIG. 3. 

The ornamental design for a chain, as shown and described. 